package com.woniuxy.bookmall.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurer;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
@EnableCaching
public class CacheConfiguration implements CachingConfigurer {
    /**
     * redis连接工厂
     * 由于使用的lettuce
     * 所以由LettuceConnectionFactory创建
     */
    private final RedisConnectionFactory factory;
    @Autowired
    public CacheConfiguration(RedisConnectionFactory factory) {
        this.factory = factory;
    }
    /**
     * 此处使用的lettuce连接池
     * factory初始化位置在 LettuceConnectionConfiguration
     */
    @Bean
    public RedisTemplate<Object, Object> redisTemplate() {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(serializer());
        // 序列化器
        template.setValueSerializer(serializer());
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(serializer());

        // 使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.afterPropertiesSet();
        return template;
    }
    /**
     * 缓存管理器
     * -> 使用redis做cache缓存注解管理
     * -> 修改原生的序列化方式改为json方式
     */
    @Override
    public CacheManager cacheManager() {
        RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .disableCachingNullValues()
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(serializer()));
        return RedisCacheManager.builder(factory).cacheDefaults(cacheConfiguration).build();
    }
    /**
     * json序列化器
     */
    private Jackson2JsonRedisSerializer<Object> serializer() {
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        // 指定要序列化的域，field,get和set,以及修饰符范围，ANY是都有包括private和public
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        // 指定序列化输入的类型，类必须是非final修饰的，final修饰的类，比如String,Integer等会跑出异常
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

        return jackson2JsonRedisSerializer;
    }
}
